20020450243 has 4 divisors (see below), whose sum is σ = 20022137128. Its totient is φ = 20018763360.

The previous prime is 20020450223. The next prime is 20020450267. The reversal of 20020450243 is 34205402002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20020450243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20020450223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 825513 + ... + 849418.

It is an arithmetic number, because the mean of its divisors is an integer number (5005534282).

Almost surely, 2^20020450243 is an apocalyptic number.

20020450243 is a deficient number, since it is larger than the sum of its proper divisors (1686885).

20020450243 is a wasteful number, since it uses less digits than its factorization.

20020450243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1686884.

The product of its (nonzero) digits is 1920, while the sum is 22.

Adding to 20020450243 its reverse (34205402002), we get a palindrome (54225852245).

The spelling of 20020450243 in words is "twenty billion, twenty million, four hundred fifty thousand, two hundred forty-three".